• Code: 3500
• Description: Scan ASIC Error
  The scan ASIC has been inoperative.
• Causes: Defective main PWB.
• Remedy: Defective main PWB. Replace the main PWB and check for correct operation .

• Code: 4000
• Description: Polygon motor synchronize error
  Polygon motor is not stabilized within 15 s since the motor is activated. After polygon motor is stabilized, the ready signal is not detected for 7 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective polygon motor. Defective main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor and main PWB (YC17)
  Defective polygon motor. Replace the laser scanner unit .
  Defective main PWB. Replace the main PWB and check for correct operation .

• Code: 4200
• Description: BD stability error
  The BD signal is not detected for 1000 ms after processing the compulsion lighting. At the interrupt in VSYNC, the BD error is detected continuously for 10 times in 400 ms intervals.
• Causes: Defective connector cable or poor contact in the connector. Defective APC PWB. Defective main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit (YC1) and main PWB (YC5)
  Defective APC PWB. Replace the laser scanner unit .
  Defective main PWB. Replace the main PWB and check for correct operation .

• Code: 6000
• Description: Broken fuser heater
  The temperature does not reach 100° C/212 °F after the fuser heater lamp has been turned on continuously for 30 s. At the time of 20 degrees or less from specified temperature, the fuser temperature does not rise by 2 degrees or more after the fuser heater lamp has been turned on continuously for 8 s.(during ready or during print)
• Causes: Defective connector cable or poor contact in the connector. Fuser thermostat triggered. Defective fuser heater. Defective main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. fuser heater lamp and Power source PWB (YC102).
  Fuser thermostat triggered. Replace the fuser unit .
  Defective fuser heater. Replace the fuser unit .
  Defective main PWB. Replace the main PWB and check for correct operation .

• Code: 6020
• Description: Abnormally high fuser thermistor temperature
  Fuser thermistor detects a temperature higher than 210°C/410°F for 3 s
• Causes: Deformed connector pin. Shorted fuser thermistor. Defective power source PWB. Defective main PWB.
• Remedy: Deformed connector pin. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Shorted fuser thermistor. Replace the fuser unit .
  Defective power source PWB. Replace the power source PWB
  Defective main PWB. Replace the main PWB and check for correct operation .

• Code: 6030
• Description: Broken fuser thermistor wire
  Average input AD given by the thermistor is less than 2 for 300msec.
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor wire. Fuser thermostat triggered. Defective main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Fuser unit and main PWB (YC15)
  Broken fuser thermistor wire. Replace the fuser unit .
  Fuser thermostat triggered. Replace the fuser unit .
  Defective main PWB. Replace the main PWB and check for correct operation .

• Code: 6400
• Description: Fixing control zero cross signal error
  The ZCROSS signal does not reach the main PWB for more than 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective power source PWB. Defective main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Power source PWB (YC103) and main PWB (YC12)
  Defective power source PWB. Replace the power source PWB .
  Defective main PWB. Replace the main PWB and check for correct operation .

• Code: F000
• Description: Communication Error between Main PCB and Panel PCB
  Communication failure during the start-up or operation. * : Only 3 in 1 25/26 ppm model, 4 in 1 20/21, 25/26 ppm model
• Causes: Defective main PWB. Defective operation PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB .
  Defective operation PWB. Replace the operation PWB and check for correct operation.